{"product_id":"oetai-gdsc21w-gds-c21w-color-mark-sensor","title":"OETAI GDS-C21W Color Mark Sensor - Precision Color Tracking \u0026 Mark Detection","description":"\u003c!-- SEO Introduction --\u003e\n\u003csection class=\"koeed-container\"\u003e\n  \u003ch2 style=\"color: #0056b3;\"\u003eOETAI GDS-C21W High-Precision Color Mark Sensor\u003c\/h2\u003e\n  \u003cp\u003e\n    The \u003cstrong\u003eOETAI GDS-C21W\u003c\/strong\u003e is a flagship photoelectric sensor engineered for high-speed \n    \u003cstrong\u003ecolor mark detection\u003c\/strong\u003e in packaging and printing industries. Featuring advanced \n    optical processing, it identifies subtle color contrasts on various substrates—including high-gloss \n    films and metallic foils. This precision sensor ensures millisecond-accurate positioning for \n    cutting, folding, and sorting, significantly reducing waste in high-volume production lines.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eKeywords:\u003c\/strong\u003e OETAI GDS-C21W, Color Mark Sensor, Photoelectric Registration Mark, Packaging Machinery Sensor, Print Positioning Sensor.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003chr style=\"border: 0; border-top: 1px solid #eeeeee; margin: 20px 0;\"\u003e\n\n\u003c!-- Technical Specifications --\u003e\n\u003csection class=\"koeed-specs\"\u003e\n  \u003ch3 style=\"color: #0056b3;\"\u003eTechnical Specifications\u003c\/h3\u003e\n  \n  \u003cdiv style=\"overflow-x: auto;\"\u003e\n    \u003ctable style=\"width: 100%; border-collapse: collapse; text-align: left; font-size: 14px;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background-color: #16c8c8; color: #ffffff;\"\u003e\n          \u003cth style=\"padding: 12px; border: 1px solid #eeeeee;\"\u003eParameter\u003c\/th\u003e\n          \u003cth style=\"padding: 12px; border: 1px solid #eeeeee;\"\u003eSpecification\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eModel\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eGDS-C21W\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eDetection Method\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eDiffuse Reflective (Coaxial)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eSupply Voltage\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e10-30V DC\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eOutput Type\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eNPN \/ PNP (Model Dependent)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eResponse Time\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e\u0026lt; 0.5ms\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003c!-- Application \u0026 Reliability --\u003e\n\u003csection class=\"koeed-application\" style=\"margin-top: 25px;\"\u003e\n  \u003ch3 style=\"color: #0056b3;\"\u003eApplication \u0026amp; Industrial Value\u003c\/h3\u003e\n  \u003cp\u003e\n    The GDS-C21W utilizes a \u003cstrong\u003ecoaxial optical system\u003c\/strong\u003e which eliminates sensitivity to \n    material shaking, making it ideal for \u003cstrong\u003eVertical Form Fill Seal (VFFS)\u003c\/strong\u003e machines. \n    By accurately detecting registration marks on moving webs, it enables PLC systems to synchronize \n    cutting tools with sub-millimeter precision. Its IP67-rated housing ensures reliability in \n    dust-heavy environments like flour packaging or chemical processing plants.\n  \u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003c!-- Koeed B2B Tool: Contrast \u0026 Logic Checker --\u003e\n\u003csection id=\"koeed-tool-section\" style=\"margin: 30px 0; padding: 25px; border: 2px solid #16c8c8; border-radius: 8px; background-color: #fff;\"\u003e\n  \u003ch3 style=\"text-align: center; color: #16c8c8; margin-top: 0;\"\u003eKoeed Interactive: Mark Reliability Estimator\u003c\/h3\u003e\n  \u003cp style=\"font-size: 13px; text-align: center; color: #666;\"\u003eEvaluate if your color combination is reliable for optical detection.\u003c\/p\u003e\n  \n  \u003cdiv style=\"display: flex; flex-direction: column; gap: 15px; max-width: 450px; margin: 0 auto;\"\u003e\n    \u003cdiv\u003e\n      \u003clabel for=\"koeed-mark-color\" style=\"display: block; margin-bottom: 5px; font-weight: bold;\"\u003eMark Color (Registration):\u003c\/label\u003e\n      \u003cinput type=\"color\" id=\"koeed-mark-color\" value=\"#000000\" style=\"width: 100%; height: 40px; border: 1px solid #ccc; cursor: pointer;\"\u003e\n    \u003c\/div\u003e\n    \n    \u003cdiv\u003e\n      \u003clabel for=\"koeed-bg-color\" style=\"display: block; margin-bottom: 5px; font-weight: bold;\"\u003eBackground Color:\u003c\/label\u003e\n      \u003cinput type=\"color\" id=\"koeed-bg-color\" value=\"#ffffff\" style=\"width: 100%; height: 40px; border: 1px solid #ccc; cursor: pointer;\"\u003e\n    \u003c\/div\u003e\n\n    \u003cbutton onclick=\"koeedAnalyzeContrast()\" style=\"background-color: #16c8c8; color: white; border: none; padding: 14px; cursor: pointer; border-radius: 4px; font-weight: bold; font-size: 16px;\"\u003eAnalyze Contrast Ratio\u003c\/button\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv id=\"koeed-tool-result\" style=\"margin-top: 20px; padding: 15px; background: #f9f9f9; border-left: 4px solid #16c8c8; display: none;\"\u003e\u003c\/div\u003e\n\n  \u003cnoscript\u003e\n    \u003cp\u003eWarning: For optimal performance, ensure a high contrast ratio between the registration mark and the background. Dark marks on light backgrounds (or vice-versa) yield the best signal-to-noise ratio for the GDS-C21W.\u003c\/p\u003e\n  \u003c\/noscript\u003e\n\u003c\/section\u003e\n\n\u003c!-- Troubleshooting FAQ --\u003e\n\u003csection class=\"koeed-faq\"\u003e\n  \u003ch3 style=\"color: #0056b3;\"\u003eTroubleshooting \u0026amp; Maintenance\u003c\/h3\u003e\n  \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n    \u003cp\u003e\u003cstrong\u003eQ1: The sensor is outputting erratic signals even without a mark.\u003c\/strong\u003e\u003cbr\u003e\n    \u003cem\u003eA:\u003c\/em\u003e This is often caused by \u003cstrong\u003ematerial flutter\u003c\/strong\u003e or gloss reflection. Ensure the sensor is mounted at a slight angle (approx. 10-15°) relative to the perpendicular surface if the material is highly reflective (like aluminum foil) to avoid specular glare.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n    \u003cp\u003e\u003cstrong\u003eQ2: How do I switch between Light-ON and Dark-ON?\u003c\/strong\u003e\u003cbr\u003e\n    \u003cem\u003eA:\u003c\/em\u003e The GDS-C21W typically features a control wire (white or pink) for mode selection. Connecting this wire to VCC or GND will toggle the output logic. Reference your specific wiring diagram to ensure the signal matches your PLC's logic (Normally Open\/Closed).\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n    \u003cp\u003e\u003cstrong\u003eQ3: The sensitivity button (Teach-in) is not responding.\u003c\/strong\u003e\u003cbr\u003e\n    \u003cem\u003eA:\u003c\/em\u003e Ensure the sensor is within the 10-15mm optimal focal range. If the distance is too far, the optical feedback will be too weak for the internal processor to complete the \"Teach\" cycle. Clean the lens with a soft, lint-free cloth.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003c!-- JavaScript Logic --\u003e\n\u003cscript\u003e\nfunction koeedAnalyzeContrast() {\n  const mark = document.getElementById('koeed-mark-color').value;\n  const bg = document.getElementById('koeed-bg-color').value;\n\n  function hexToRgb(hex) {\n    const r = parseInt(hex.slice(1, 3), 16);\n    const g = parseInt(hex.slice(3, 5), 16);\n    const b = parseInt(hex.slice(5, 7), 16);\n    return { r, g, b };\n  }\n\n  function getLuminance(rgb) {\n    const a = [rgb.r, rgb.g, rgb.b].map(v =\u003e {\n      v \/= 255;\n      return v \u003c= 0.03928 ? v \/ 12.92 : Math.pow((v + 0.055) \/ 1.055, 2.4);\n    });\n    return a[0] * 0.2126 + a[1] * 0.7152 + a[2] * 0.0722;\n  }\n\n  const lum1 = getLuminance(hexToRgb(mark));\n  const lum2 = getLuminance(hexToRgb(bg));\n  const ratio = (Math.max(lum1, lum2) + 0.05) \/ (Math.min(lum1, lum2) + 0.05);\n\n  const resultDiv = document.getElementById('koeed-tool-result');\n  resultDiv.style.display = 'block';\n  \n  let status = \"\";\n  let color = \"\";\n  \n  if (ratio \u003e 5) {\n    status = \"Excellent Contrast: Highly reliable detection.\";\n    color = \"#28a745\";\n  } else if (ratio \u003e 2) {\n    status = \"Moderate Contrast: Requires precise sensitivity tuning.\";\n    color = \"#ffc107\";\n  } else {\n    status = \"Critical Warning: Contrast too low. Sensor may fail or require specialized lens.\";\n    color = \"#dc3545\";\n  }\n\n  resultDiv.innerHTML = `\n    \u003cdiv style=\"font-weight: bold; color: ${color}; margin-bottom: 8px;\"\u003eAnalysis: ${status}\u003c\/div\u003e\n    \u003cdiv style=\"font-size: 14px;\"\u003eContrast Ratio: \u003cstrong\u003e${ratio.toFixed(2)}:1\u003c\/strong\u003e\u003c\/div\u003e\n    \u003cp style=\"font-size: 12px; margin-top: 10px; color: #555;\"\u003eRecommendation: If the ratio is below 3, consider using a mark color that is optically distinct from the background (e.g., Red mark on Green background may appear similar to a monochromatic sensor).\u003c\/p\u003e\n  `;\n}\n\u003c\/script\u003e\n\n\u003c!-- Structured Data --\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How to handle material flutter with GDS-C21W?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Mount the sensor at a 10-15 degree angle to prevent specular reflection from glossy materials and ensure stable detection during material flutter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the response time of OETAI color mark sensor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The GDS-C21W has a response time of less than 0.5ms, making it suitable for high-speed industrial printing and packaging applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How to switch between NPN and PNP logic?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Logic is usually hardware-defined. Check the control wire (white\/pink) for Light-ON\/Dark-ON switching, but ensure the model number matches your PLC's NPN or PNP requirement.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"WebApplication\",\n  \"name\": \"Koeed Mark Reliability Estimator\",\n  \"operatingSystem\": \"All\",\n  \"applicationCategory\": \"IndustrialTool\",\n  \"description\": \"Analyzes the contrast ratio between mark and background colors to predict sensor detection reliability.\"\n}\n\u003c\/script\u003e","brand":"OETAI","offers":[{"title":"Default Title","offer_id":44237934330041,"sku":"166333265239","price":114.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/8476\/7929\/files\/s-l1600_c9c9607d-4ee0-4f87-b822-584ab8ae4e6d.png?v=1723677401","url":"https:\/\/koeed.com\/da\/products\/oetai-gdsc21w-gds-c21w-color-mark-sensor","provider":"KOEED","version":"1.0","type":"link"}